DE20210050U1 - Paper blank foldable to form three dimensional article has cut and punched tongues formed on sheet to retain second edge of sheet and hold it curved - Google Patents

Abstract

The paper blank has fold lines and cut out portions to allow it to be erected into a three dimensional shape. The blank can be folded with one edge retained by cut out tongues adjacent to the other edge to hold the folded section in a curved condition to form the three dimensional shape. Alternatively, a separate panel can be held in a curved condition by punched out tongues adjacent the edges of the blank.

Description

Description

In the usual production of three-dimensional objects from two-dimensional foldable materials (paper, cardboard, plastic, hard rubber, wood, sheet metal), in order to fix the two-dimensional material in its shape, the material must be glued, welded, pressed, stapled or otherwise processed in a complicated, additional work step. In addition, this work step is usually irreversible without damaging the material. In order to shape the material, additional manufactured objects often have to be attached. These are then always processed in a further work step.

In the pacecrack system, the foldable material itself acts as the supporting and holding element. A foldable material, e.g. a sheet of paper, has little, if any, rigidity. It can be easily bent (drawing 4). However, if I fold the sheet and open the folded sheet a little (drawing 5), the sheet is stiffened along the fold line. It is much more stable and stronger. Now the slightly opened fold is fixed. This is done by precisely placed cuts in the material (drawing 6), which serve as holding tabs. The low rigidity that the material has is only used to fix the bend angle created with the help of the cuts that serve as tabs. This creates a new, much higher rigidity of the material.

The combination of precisely placed fold lines and the inserts punched at the correct distance from them stiffens the material itself. The notches that serve as tabs are at a certain distance from the crease created. One side of the crease, on which the notches that serve as tabs are located, is called side A. The other side, which is inserted into the tab to fix it, is called side B. The vertical distance of the notches to the crease on side A corresponds to between 30 and 98% of the vertical distance of the edge that is inserted into the tab, on side B to the crease (drawing 2). This ratio creates the stiffening crease after side B has been inserted into the tab.

Since surfaces are better suited to precise calculations than curves, side B can also be provided with an additional fold (Figure 7). However, each fold in side B costs this side some of its basic rigidity, which it uses to hold the cuts that serve as tabs in place. However, a single fold can give side B additional stability under certain loads (Figure 8).

In order to be able to fix side B precisely between the tabs, it is advisable to provide retaining edges that fit exactly into the tabs at the points where the side is inserted into the tabs (drawing 9). This means that the side inserted into the tab can no longer slip. This applies in particular to the additionally inserted side, as defined in the second protection claim. This is because this additionally inserted side can otherwise easily slip.

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The groove lines that enable precise folding and the incisions that serve as tabs are added to the material in one operation, the punching. No adhesives, glues or machines are needed to hold the material in place and turn it into containers or load-bearing elements.

Just by correctly placing folding lines, making cuts at the right distance and simply pushing the tabs together, the foldable material acquires the desired new properties and can be used more universally. The pacecrack system saves raw materials, work steps and the raw material can be recycled much more easily.

Attached is a demonstration of the utility model "pacecrack" to be protected. By combining the correctly coordinated fold lines and cuts, a solid object is created from the foldable material.

Claims (2)

1. Pacecrack system that stiffens a foldable material (paper, cardboard, plastic, hard rubber, wood, sheet metal) by means of fold lines and fixing incisions serving as tabs, and allows it to be used as a container or load-bearing element, characterized in that the material stiffens itself after side B has been inserted into the tab(s) of side A through the combination of precisely placed fold lines and the insertion tab punched at the correct distance from them (drawing 1). The vertical distance of the fixing incisions serving as insertion tabs to the fold on side A corresponds to between 30 and 98% of the vertical distance of the edge to be inserted into the tab on side B to the fold (drawing 2), even if the edge of side B does not run parallel to the incisions on side A. 2. Pacecrack system that stiffens a foldable material (paper, cardboard, plastic, hard rubber, wood, sheet metal) by means of fold lines and fixing notches serving as tabs, and allows it to be used as a container or load-bearing element, characterized in that the side to be inserted into the opposite insertion tabs is curved or bent by the fixing between the tabs. Through this combination, the side fixed between the tabs gives the entire workpiece strength and support (drawing 3). The vertical distance of the opposite fixing notches serving as insertion tabs corresponds to between 30 and 98% of the vertical distance of the additional side to be inserted into the tab.